re PR middle-end/80163 (ICE on hopefully valid code)

	PR middle-end/80163
	* varasm.c (initializer_constant_valid_p_1): Disallow sign-extending
	conversions to integer types wider than word and pointer.

	* gcc.dg/pr80163.c: New test.

From-SVN: r246607

gcc/ChangeLog

 2017-03-31  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/80163
+	* varasm.c (initializer_constant_valid_p_1): Disallow sign-extending
+	conversions to integer types wider than word and pointer.
+
 	PR debug/80025
 	* cselib.h (rtx_equal_for_cselib_1): Add depth argument.
 	(rtx_equal_for_cselib_p): Pass 0 to it.

gcc/testsuite/ChangeLog

 2017-03-31  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/80163
+	* gcc.dg/pr80163.c: New test.
+
 	PR debug/80025
 	* gcc.dg/torture/pr80025.c: New test.
 

gcc/testsuite/gcc.dg/pr80163.c

+/* PR middle-end/80163 */
+/* { dg-do compile { target int128 } } */
+/* { dg-options "-O0" } */
+
+void bar (void);
+
+__int128_t *
+foo (void)
+{
+a:
+  bar ();
+b:;
+  static __int128_t d = (long) &&a - (long) &&b;	/* { dg-error "initializer element is not computable at load time" } */
+  return &d;
+}
+
+__int128_t *
+baz (void)
+{
+  static __int128_t d = (long) (3 * 4);
+  return &d;
+}

gcc/varasm.c

@@ -4472,8 +4472,15 @@ initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
 	  return initializer_constant_valid_p_1 (src, endtype, cache);
 
 	/* Allow conversions between other integer types only if
-	   explicit value.  */
-	if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
+	   explicit value.  Don't allow sign-extension to a type larger
+	   than word and pointer, there aren't relocations that would
+	   allow to sign extend it to a wider type.  */
+	if (INTEGRAL_TYPE_P (dest_type)
+	    && INTEGRAL_TYPE_P (src_type)
+	    && (TYPE_UNSIGNED (src_type)
+		|| TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type)
+		|| TYPE_PRECISION (dest_type) <= BITS_PER_WORD
+		|| TYPE_PRECISION (dest_type) <= POINTER_SIZE))
 	  {
 	    tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
 	    if (inner == null_pointer_node)